Re: [PATCH v13 0/8] pv event interface between host and guest

Gleb Natapov
2013-03-04T11:00:30Z

On Mon, Mar 04, 2013 at 11:49:07AM +0100, Paolo Bonzini wrote:
> Il 04/03/2013 11:43, Gleb Natapov ha scritto:
> > > Anyhow, this does not apply to the next submission of this series. I
> > > think we can agree to the compromise of using ACPI but still read the
> > > port in _STA.
> >
> > If you want to make ioport configurable I do not see how can we avoid
> > patching.
>
> I want to make the ioport configurable in the device, but the PIIX and
> ICH9 (which are what the DSDT is written for) will always use port 0x505.
>
But the device is not part of PIIX or ICH9. It is additional device that
may or may not be present depending on a command line. So what if
someone configures debugcon or debugexit to use this port? We can always
blame the users, but I fill that we are making unnecessary compromises.

> You can configure a different iobase for your serial ports, the guest
> can still use them but not discover them via ACPI. This is the same thing.
>
Probably we should patch DSDT too when it will be in QEMU :) of force
iobase to spec values if device is used as part of a chipset.

--
Gleb.